Chroma 65mm Square H-alpha 3nm Telescope Filter

Brand: Chroma

SKU : CF-HA3-65S

- Read
Looking for a Chroma 65mm Square H-alpha 3nm Telescope Filter? Shop this product at Agena Astro by clicking the SHOP NOW button!
SHOP NOW
Add to Wishlist

52D158B8-B55E-4DF3-8064-D4A13DFFDDC4 Request stock alerts and we'll let you know when the item is back in stock

Got questions? Click for live chat

Product Details

  • Please Note:The interference coatings that optical filters are made with are angle-sensitive and shift to the blue with fast focal ratios. This is not a problem for filters 5nm or wider, but the 3nm filters shift enough to compromise transmission at the wavelength line of interest. Chroma has made a set of Ha, OIII and SII 3nm that are optimized for F/3 beams by moving the center wavelength slightly into the red so they will shift slightly to the blue when used in an F/3 beam, thus maximizing transmission at the nominal wavelength. For beams faster than F/3, we recommend using 5nm-wide or wider bands.

    The Chroma 65mm Square H-alpha 3nm Narrowband Filter is essential for imaging objects, like nebulae, that are rich in ionized hydrogen atoms. These line emission filters work extremely well in heavy light polluted areas and allow you image on nights when the moon is up.

    Chroma manufactures the highest quality astronomy filters with durable, sputtered hard coating using single substrates of the best glass, eliminating the need for laminations. All primary filter coatings are applied on the front surface and anti-reflection coatings on the rear surface to prevent ghosting and to maximize transmission.

    Highly precise and accurate, the passbands of these filters remain spectrally stable and do not drift in response to extreme temperature fluctuations or changes in humidity.

    • 65mm Square H-alpha 3nm Narrowband Filter
    • Parfocal for systems f/4.0 or slower
    • Transmitted wavefront better than 0.25 waves/inch
    • Made in America
  • specifications

    Bandpass3nm
    Filter ShapeSquare
    Filter Thickness1mm
    Filter TypeH Alpha
    Free ShippingYes
    Size65mm

Product Reviews